Applying the same regulations in the US will take decades for criminals to no longer have many guns and then they will switch to knives and screwdrivers as we see in the UK
That seems like a thing to pursue rather earlier than later if it takes so long to bear fruits. Knives and screwdrivers are at least only used for close-up combat.
The best approach would be to address the underlying factors and causes of all violence while still allowing freedoms for the 44% who do not support stricter regulation.
To have the money for that you would need abolish capitalism I guess...